workaround fix the menuitem underscore problem

workaround fix for
#1

So the problem now is that the default value for
mnemonicParsingProperty is true.

MenuBar_1.java

@@ -62,6 +62,7 @@ public void handle(ActionEvent e)
 		};
 
 		for (MenuItem menuItem: menuItems){
+			menuItem.setMnemonicParsing (false); // to avoid underscore problem
 			m.getItems().add(menuItem);
 			menuItem.setOnAction (event);
 		}

README.md

@@ -18,3 +18,8 @@ On `Linux`:
 
 ![jfx-menuitem-problem-linux.png](images/jfx-menuitem-problem-linux.png)
 
+The `underscore` problem can be resolved setting the `MenuItem.mnemonicParsingProperty` to `false`:
+
+```
+	menuItem.setMnemonicParsing (false); // to avoid underscore problem
+```